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Duggin's quests reward you with house item dishes. They're not in a series, you may take your pick, but you may only have one of his quests at a time.

All Duggin's quests scale to your level, up to 50, but the XP will grey out shortly thereafter.

According to Domino, the EQ2 Tradeskill Dev, "The quests are infinitely repeatable, though they cap at level 50 and will start greying out on the XP after that (they shouldn't be giving a huge amount anyway though). But you can still get them."